Chemical-bromatological composition, fractionation of carbohydrates and in vitro fiber degradation kinetics of three sugarcane (Saccharum spp.) varieties

The objectives of this work were to determine the chemical-bromatological composition, to determine the carbohydrates fractions and to estimate the kinetic variables of degradation of the fibrous (FC) and no-fiber carbohydrates (NFC), of three nutritional divergence sugarcane varieties. The Studied varieties were SP80-1842, SP79-1011 and RB845257. The varieties of intermediary production cycle showed greater values of NDF and ADF compared to the variety of early cycle. The observed FDN/Pol (Sucrose index) ratio was, respectively, 2.73; 2.82 and 2.25 for the SP80-1842, RB845257 and SP79-1011 varieties. The SP79-1011 variety presented smaller C and greater B-2 carbohydrate fractions (27.78 and 33.26%). It was possible to observe difference, using the,gavinietric technique, for the la- time and the effective degradation of NDF, with higher values for SP791011 variety (7.90 h and 10.30%, respectively). However, for the gas production technique. there was only a significant effect, for the estimate of the maximum gas volume parameter for NFC, with higher values for the varieties SP79-1011 and RB845257 of intermediary production cycle. The SP79-1011 variety was the one that showed better productive characteristic, composition chemical-bromatological, besides better values of the kinetics variables of degradation of the fiber (FC) and non fiber (CNF) carbohydrates. The gas production technique was more reliable than the results observed by file gravimetric technique.